Overly concerned with sunburn on child

[Serendipity21]

Hello
I am after some advice please!
My DS spent last week with grandparents. He is 2 years old.
When he with me I smother him in factor 50 and has never burnt.
He was sent to grandparents with cream.
He was taken out around 2pm one day, was overcast so was explained to me ‘no cream was required‘ 🙄 6 hours after I bought him home, the front of his legs were pink. They did not seem to hurt him, and he didn’t complain or cry. Based on these I thought it had to be something like eczema. I applied some cream and again, no complaints. In the morning they were still pink but not as bad as the night before. Again, no complaints. The following day there was abit of extra colour but pretty much back to normal. Over a week later there has been no peeling or anything you would expect with sunburn.
I have in my head it was sunburn and I am furious with grandparents they didn’t have the sense to put cream on him and here is my issue. I suffer severe anxiety and I am now convinced DS will get skin cancer later in life. I can’t stop thinking about it. Am I being stupid about this???? Was it even sunburn if it didn’t peel or hurt him? Is it normal for a child not to peel?
Any advice would be appreciated - no need to tell me suncream is essential - I know this already and I am so upset/disappointed this has happened.

It's not just vitamin d either. There is a growing body of evidence to show that the deep cell reactions caused by sunlight on the skin are important for body health in a variety of ways, including countering inflammation. A balanced approach is needed to sun exposure.

I’m going to go against the grain here, as I was diagnosed with a form of skin cancer earlier this year - I’m extremely pale and freckly so high risk anyway, but one bad sunburn can cause problems in later life.

However, slightly pink legs don’t mean a bad sunburn, if he was blistering etc then I’d be angry, but a bit pink is a reminder to take more care in future.